powerful relief of nasal congestion and other allergy symptoms -- all in one pill. zyrtec-d®. at the pharmacy counter. >>> welcome back. we take you around the world this 60 minutes. in iran, the government is moving forward with its nuclear program by installing new centrifuges hat an iranian enrichment plant. in experts say that will allow iran to enrich uranium at a rate three to five times greater than before. this you'move could jeopardize s with the u.s. and other countries. >> want to bring in elyse on this. what does this mean in terms of the equation here, what do we think iran is capable of when you look at its nuclear potential, is it something the u.s. should be worried about? >> ultimately down the road. right now no one knows where wl these centrifuges will even work because iran has had a lot of trouble in the past using this type of technology. but once they do start spinning, it means iran could produce nuclear material at a much higher rate and the concern that officials say is they could sneak out and have enough material for a nuclear bomb and they're alrea